Influence of the base and diluent monomer on network characteristics and mechanical properties of neat resin and composite materials

• Published in: Odontology 2015-05, Vol.103 (2), p.160-168
• Main Authors: de Godoy Fróes-Salgado, Nívea Regina, Gajewski, Vinícius, Ornaghi, Bárbara Pick, Pfeifer, Carmem Silvia Costa, Meier, Marcia Margarete, Xavier, Tathy Aparecida, Braga, Roberto Ruggiero
• Format: Article
• Language: English
• Subjects: Bisphenol A-Glycidyl Methacrylate - chemistry; Composite materials; Composite Resins - chemistry; Dental Materials - chemistry; Dentistry; Elastic Modulus; Fatty Alcohols - chemistry; Hardness; Materials Testing; Mechanical properties; Medicine; Methacrylates - chemistry; Odontology; Oral and Maxillofacial Surgery; Original Article; Polyethylene Glycols - chemistry; Polymerization; Polymethacrylic Acids - chemistry; Resins; Solubility; Sorption; Surface Properties
• ISSN: 1618-1247; 1618-1255
• DOI: 10.1007/s10266-014-0153-6

[Abstract] This study evaluated the effect of the combination of two dimethacrylate-based monomers [bisphenol A diglycidyl dimethacrylate (BisGMA) or bisphenol A ethoxylated dimethacrylate (BisEMA)] with diluents either derived from ethylene glycol dimethacrylate (ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate) or 1, 10-decanediol dimethacrylate (D3MA) on network characteristics and mechanical properties of neat resin and composite materials. The degree of conversion, maximum rate of polymerization and water sorption/solubility of unfilled resins and the flexural strength and microhardness of composites (after 24 h storage in water and 3 months storage in a 75 vol% ethanol aqueous solution) were evaluated. Data were analyzed with two-way ANOVA and Tukey's test (α=0.05). The higher conversion and lower water sorption presented by BisEMA co-polymers resulted in greater resistance to degradation in ethanol compared with BisGMA-based materials. In general, conversion and mechanical properties were optimized with the use of long-chain dimethacrylate derivatives of ethylene glycol. D3MA rendered more hydrophobic materials, but with relatively low conversion and mechanical properties.